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Showing 1 to 19 of 19 for “"IODP"”.
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Paleoceanography across the Pliocene–Pleistocene transition in the southern Bering Sea: dinoflagellate cysts and acritarchs from IODP Site U1341
The latest Pliocene–earliest Pleistocene (2.828 Ma to 2.401 Ma) interval from Integrated Ocean Drilling Program Site U1341, Bowers Ridge, southern Bering Sea, northern North Pacific has been analyzed for dinoflagellate cysts, acritarchs and other palynomorphs. Based on 86 samples, with a spacing …
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Central North Atlantic (IODP Site U1313) paleoceanography based on a high-resolution dinoflagellate cyst record across the Early–Middle Pleistocene boundary (Marine Isotope Stages 20–18, ~810–741 ka)
A dinoflagellate cyst (dinocyst) study of 102 samples from Integrated Ocean Drilling Program Site U1313 in the central North Atlantic Ocean represents the most detailed dinocyst record yet available for Marine Isotope Stage (MIS) 19, which spans the Lower–Middle Pleistocene boundary. A published …
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Terrigenous Grain-Size Record of the Newfoundland Ridge Contourite Drift, IODP Site U1411: The First Physical Proxy Record of North Atlantic Abyssal Current Intensity during the Eocene-Oligocene Transition
… Newfoundland Ridge contourite drift complex at IODP Site U1411, which is interpreted to have formed under the influence of the Deep Western Boundary Current. We analyzed 195 samples that span 150 m of stratigraphy from 36-26 Ma. The main objective was to use the 'sortable silt' fraction (10-63 …
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High-latitude sedimentation in response to climate variability during the Cenozoic
… from two International Ocean Discovery Program (IODP) Sites U1525 and U1524. Each of these sites is discussed in separate chapters here (Chapters 1 and 2). This interval experienced the change from the warming of the Late Pliocene, known as the Mid-Piacenzian Warming Period, to the Pleistocene …
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Formation and Evolution of Valdivia Bank, Walvis Ridge, South Atlantic Ocean from Geophysical Data and International Ocean Discovery Program Expedition 391 Drilling Results
… G. Thompson. In 2021, the plateau was scored by IODP Expedition 391. In my research, I produce a detailed bathymetry map of Valdivia Bank and interpret the morphology and seafloor geologic processes on the plateau. Then, I utilize IODP Expedition 391 coring results to develop an age model of …
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HYDROTHERMAL FLUID TRANSPORT PATHWAYS ALONG FRACTURES AND VEINS AT BROTHERS VOLCANO, SOUTHERN KERMADEC ARC
… creation dominates Brothers volcano. Data from IODP Exp. 376 shipboard scientists and post expedition studies were used for paleomagnetic reorientation, downhole linear regression correlation of defining characteristics, and thin section observation. This study finds that regional tectonics are …
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Normalized mechanical properties of resedimented Gulf of Mexico clay from Integrated Ocean Drilling Program Expedition Leg 308
During Integrated Ocean Drilling Program (IODP) Expedition Leg 308, many Whole Core Samples were recovered from the Ursa Basin in the Gulf of Mexico. Post-cruise geotechnical testing found these samples to be highly disturbed due to the sampling process. This research will determine mechanical …
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Thermal Modeling of Cooling Time of Submarine Dacite Lapilli Tuff: Brothers Volcano, Kermadec Arc
… on two drill sites on Brothers volcano from IODP Expedition 376: Site U1528, located on the resurgent cone, and Site U1530, located on the caldera rim. Expedition researchers analyzed samples for clast radius, density, thermal conductivity, and specific heat. This data was then entered into …
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EASTERN EQUATORIAL PACIFIC PRODUCTIVITY VIA TWO GEOCHEMICAL PROXIES
… Pacific cores RR0603-03TC and RR0603-03JC (IODP site survey cruise for Proposal 626) have been used as a reference for geochemical concentration parameters, as well as a comparison tool for productivity variations among the central and eastern sites. The central equatorial geochemistry …
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Cenozoic Variations in the Deep Western Boundary Current as Recorded in the Seismic Stratigraphy of Contourite Drifts, Newfoundland Ridge, Offshore Canada
… profiles constrained by drill sites from IODP Expedition 342 are used to map the spatial and temporal distribution of contourite sedimentation and to evaluate the Cenozoic history of the DWBC within a preexisting climatic framework. This study indicates three phases of sedimentation termed …
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The Dynamics of the Late Neogene Antarctic Ice Sheets in the Central Ross Sea using a Multianalytical Approach
… Miocene, the provenance of glacial till from IODP expedition 374 site U1522 was assessed using a suite of three analyses. A total of 3,869 zircons, between 250-63 microns in size, from sixteen different cores were measured for U-Pb isotopes via LA-ICP-MS. Zircon data was compared to neodymium …
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Reconstructing atmospheric changes in Monsoon regions using eolian dust
… radiogenic neodymium isotopes (143Nd/144Nd) at IODP Site U1430 in the Sea of Japan to fingerprint the provenance of eolian material at the core site from Asian dust sources. I then generate a 143Nd/144Nd record from isolated eolian material over the last 200 ka to examine Westerly Jet behavior …
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Fracture Analysis of the Lower Oceanic Crust, Atlantis Bank, Southwest Indian Ridge
… (ODP) or International Ocean Discovery Program (IODP). This study analyzed core and downhole petrophysical logs (Ultrasonic Borehole Imager and Formation Microscanner) in order to locate and determine the orientation of fractures and joints throughout the three holes. The use of petrophysical …
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POPULATION DYNAMICS AND GEOCHEMISTRY OF BENTHIC AND PLANKTONIC FORAMINIFERA TO INTERPRET THE PALEOCEANOGRAPHIC CHANGES ACROSS THE CENOMANIAN-TURONIAN OCEANIC ANOXIC EVENT 2 AT LOW AND HIGH LATITUDES
… Basin (SE England) at low latitudes and IODP Sites U1513 and U1516 in the Mentelle Basin (SW Australia) at high latitudes. Taxonomy, quantitative and statistical analysis have been performed on foraminifera to reconstruct paleoenvironmental and paleoceanographic changes across the OAE 2. …
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Antarctica's Geologic and Ice Sheet History from Isotopic Sedimentary Provenance Studies
… the terrigenous fine fraction across the MMCT in IODP Site U1356. The results from the two size fractions tell different stories and provide further support for the application of multiple tools. Specifically I found that (1) the hornblende ages in the MMCT of Site U1356 have a very dominant …
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Fault damage zones and friction: insights from shallow Japan Trench drill core
… during Integrated Ocean Discovery Program (IODP) Expedition 343/343T (JFAST) that characterizes structures surrounding the inferred Japan Trench décollement, and uses the results to constrain the relative magnitude of the long-term, or static friction coefficient (μs) on the fault. Datasets …
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The Challenges and Solutions of Green Seismic Survey: Imaging Deep Seafloor Structures with Cruise TN-373 Reflection Data
… of the ocean floor drilling sites for the IODP Expedition 391. Chapter 3 reviews the challenges and opportunities of future acquisition using small sources by using TN-373 as a case study. I recommend ways to optimize survey parameters for future opportunities of integrating green seismic …
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Marine carbonate accumulation during the greenhouse climate of the Eocene
… Tasman Sea, two of which were drilled during IODP Expedition 371 (U1508C and U1509A) and two of which derive from field work in New Caledonia (the Sommet-Khian outcrop and the Cadart drill core). Here we identify long-term changes in carbon and oxygen isotope records, possibly related to 405 …
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Igneous life cycles: geochemistry of magma from mantle to surface and back again
Material from within the Earth is cycled and recycled from the interior of the Earth to the surface in igneous rocks. The chemistry of igneous rocks record snapshots of this complex history. Here, we use three major projects to assess important processes in this life cycle. Continental arc …